Lead plate for electric accumulators



Sgpt.-8,- 193-1. A. Pducl-mlfi 1,822,746

LEAD PLATE FOR ELECTRIC ACQUMULATORS Filed June 4, 1928 r 5 electrolyte, is of stron Patented Sept. 8, 1931 UNITED STATES ADOLFO POUCHAIN,

' or roam, ITALY LEAD PLATE FOR ELECTRICtACCUMULA'IORS Application filed June 4, 1928 Serial No. 282,867, and in Germany January 10, 1928.

This invention has for its object a lead plate intended to provide a positive electrode for electric accumulators and which, while providing a very large contact area with the g construction and is not subject 'to deformations.

The plate according to the present invention comprises solid and parallel ribs between which projecting fins are located in i transverse direction, said fins being separate from each other and alternating with fins similarly located on the opposed surfaces of the plate, preferably in such a manner that between two adjacent ribs and the series of fins therebetween, a longitudinal passage is provided whose two opposite surfaces are interrupted between two adjacent fins.

On the annexed drawings is illustrated by Way of example an embodiment of a plate in accordance with this invention and Figure 1 is a front view of a portion of plate;

Figure 2 is a section on line 22 of Figure 1, this section being made to an enlarged scale and showing means used for the manufacture of the plate; I

Figure 3 is a section on line 3-3 of Fig. 1, showing means for the manufacture of the plate; c

Figure 4 is a; front view of a complete plate divided in sections, in which fins are differently directed.

As shown in Figures 1-3 the plate comprises opposed series of fins 1, 1 said series being separated by solid ribs 2 and encircled in their whole by a frame 3.

In each series the fins 1 are separated from each other by regular gaps 4 registering with fins located on the opposite face of the plate. ghe gaps 4 between fins 1 being in front of F ins'l and 1' of a set are thus alternating with fins 1 and 1' of the adjacent sets, as shown by Figure 2.

The internal edges of fins 1 and 1' lie on surfaces which are spaced from each other and thus each series of opposite fins 1 and 1' provides a: passage 5 confined by the internal edges of the fins and by two adjacent ribs 2.

Such a configuration may be easily 0btained from aflat plate of lead by using for each of the plate faces a punch-device of the construction illustrated in Figures 2 and 3; each of said punch devices comprises a series of superimposed plates 6- -6 having a serrated edge which provides projections 7 and recesses 7 the several plates 6-6 of each device are arranged each with its projections 7 and recesses 7 in register with recesses 7 and projections 7 of the adjacent plates of its set and of the plate in register with it or in the line-opposite to it in the cooperating punch-device intended to act on the opposite face of the lead plate (see Figs. 2 and Bolts'8 engage holes of the plates of each set to hold them in cooperative position. Of course projections 7 and recesses 7 have size and shape agreeing with those of spaces H. and fins 1-1 to be produced therefrom.

The described punch members are forced by any pressure means on the opposite faces of alead plate located therebetween to produce the required recessed and displaced metal fins in the same: in the drawings said punch devices are shown in register with and spaced from the faces of the lead plate they acted on for the manufacture, to make well clear both the shape of the plate and the construction of the punch devices.

A lead plate obtained in the described manner is of course very strong because of ribs .2 extending along it at a small distance from each other: at the same time owing to gaps intermediate the fins and passages 5 r provided intermediate ribs 2 and fins 1. 1' the plate has 'a very large area and provides an easy penetration by electrolyte.

Further the position and shape of each fin 1. 1 intermediate the adjacent ribs 2 provides for swelling of lead.

In this connection it isto be noted that when the fins'are subject to elongation owing to swelling of lead under chemical transformations operative therein,-said fins are. caused to bend outwardly without'produ cing a strong action on themembers of the frame encircling them.

In any case the elongation'of said fins is freely permitted because each of them is in register with a gap 4-4=' and the whole of the plate is not warped or distorted by effect of the lead swelling action.

To prevent any possible deformation of the plates mainly when they have large size, the arrangement of Fig. 4. may be used..

In said arrangement the plate is divided in sections 11 in which the series of fins 1-1 lie in different directions.

The frames 3 of sections 11 thus provide reinforcing ribs for the plate which in turn is encircled by a frame 12 which carries the supporting feet 9 and the extension 10 for connecting the plate with the circuit.

By the described construction of plate the small possible deformations of any of'sections 11 are perpcndicularwith respect to the deformations of the adjacent section and thus they are not adapted to cumulate with each other and the frame and plate hold permanently their shape.

What I claim as my invention and desire to secure by United States Letters Patent is 1'. A lead electrode or plate for electric accumulators, having faces and comprising a frame structure, parallel ribs in said structure, and adjacent fins parallel with each other and extending between each set of two adjacent ribs, said fins projecting alternately from said ribs on the opposite plate faces,

and the fins of each row intermediate two adjacent ribs alternating with the fins of the rows at the sides thereof.

2. A lead electrode or plate for electric accumulators, having faces and comprising a frame structure, parallel ribs in said structure, and fins extending between each two adjacent ribs, said fins being parallel with each other and projecting alternately from said ribs on the opposite plate faces, the adjacent faces of each two adjacent alternating fins lying in substantially the same plane.

3. A lead electrode or plate for electric accumulators, having faces and comprising a frame structure, parallel ribs in said structure and fins extending between each two adjacent ribs, said fins being parallel with each other and projecting alternately from said ribs on the opposite plate faces, the adj a cent faces of each two adjacent alternating fins lying in the same plane, said adjacent faces of each fin lying in planes substantially perpendicular to the plate faces.

4. A lead electrode or plate for electric accumulators, having faces and comprising ture, and fins extendin between each two adjacent ribs, said fins parallel with eing each other and projectin a ternately from.

ADOLFO. POUGHAIN.

a frame structure, parallel ribs in said structure, and adjacent fins parallel with each other and extending between each two adjacent ones of said ribs, said fins projecting alternately from said ribs on the opposite plate faces, and leaving a substantially continuous unobstructed passage intermediate them and said adjacent ribs.

5. A lead electrode or plate for electric accumulators, having faces and comprising a frame structure, parallel ribs in said struc- 

